A wooden or plastic block with tips of nails just protruding through its base, used to scratch the surface of plaster lightly to enable more plaster to adhere to it.
灰泥刮锉（有钉子尖的木块或塑料块，用于在灰泥表面轻刮以便黏附更多灰泥）
Example sentencesExamples
We key the surface using a devilling float, which is a wooden float with nails knocked in it, lightly scrape this across the surface and it will score the plaster, ensuring that the coat of finishing plaster adheres correctly.
An old wooden float with board nails in one edge is a good tool for this job (this is called a "devilling" float in the trade.)